1. INTRODUCTION

Maintenance, repair, and operations (MRO) or maintenance, repair, and overhaul involve fixing any sort of mechanical, plumbing or electrical device should it become out of order or broken. It also includes performing routine actions which keep the device in working order or prevents trouble from arising.

MRO may be defined as, "All actions which have the objective of retaining or restoring an item in or to a state in which it can perform its required function. The actions include the combination of all technical and corresponding administrative, managerial, and supervision actions.